Determining the effective coefficient of kinetic friction
A 260 kg piano slides 4.5 m down a 30° incline and is kept from accelerating by a man who is pushing back on it parallel to the incline. The effective coefficient of kinetic friction is 0.40.
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A charge of +1.62 × 10^-9 C is placed at the origin, and another charge of +6.27 × 10^-9 C is placed at x = 2.4 m. The value of the Coulomb constant is 8.98755 × 10^9 N · m2/C2.
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An electric field is set up between two parallel plates, each of area 2.0 m2, by putting 1.0 C charge on one plate and a -1.0 C charge on the other.The plates are separated by 4.0 mm. What is the magnitude of the electric field between the plates
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